export function uuid() {
  var d = new Date().getTime();
  if (window.performance && typeof window.performance.now === "function") {
  			  d += performance.now(); //use high-precision timer if available
  }
  var uuid = 'xxxxxxxxxxxx4xxxyxxxxxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
  			  var r = (d + Math.random() * 16) % 16 | 0;
  			  d = Math.floor(d / 16);
  			  return (c == 'x' ? r : (r & 0x3 | 0x8)).toString(16);
  });
  return uuid;
}